>>2260773I don't think i've seen those ones, are you talking about ones that just straight reuse the bounce ball motion or ones that are similar to it?
Here's one good one I found on iwara:
https://ecchi.iwara.tv/videos/dnbnjhd01jskk53bmEven though it looks like she's slapping her pussy and poking the top of his head.
The uploader also did a few more and outside of them i've only seen it used a couple of times on Ecchi iwara.
There were a decent amount that were on Nicovideo which I posted the link to under the motion DL but none of them are nearly as good and fluid as the original, only about 1/4 of them are good.
